I’m not Fiverr, so I don’t know their rules, but I would say that late orders are the main reason.
Especially if you have them on a permanent basis.
I had a lot of them at the beginning of the year, and they are still reflected in my stats, so I’m just waiting.
I don’t think they would just send gigs to the end with no real reason.
One more thing, as I understand, changes are not immediate. Even if you manage to restore your stats, it still needs some time to update the searching engine.
And I can see that you weren’t promoted yesterday, even though all your stats are good to be Level 1. So there must be a reason too.